catecholamine neurotransmitter in the central nervous system, retina, and sympathetic ganglia, acting within the brain to help regulate movement and emotion: its depletion may cause Parkinson's disease.
an enfolding of cerebral cortex into the lateral fissure of a cerebral hemisphere,
a disorder of the nervous system, characterized either by mild, episodic loss of attention or sleepiness or by severe convulsions with loss of consciousness
the loss of a previously held ability to speak or understand spoken or written language, due to disease or injury of the brain
A sex hormone secreted by the testes, that stimulates the development of male sex organs, secondary sexual traits, and sperm.
a soft, white, fatty material in the membrane of Schwann cells and certain neuroglial cells
any of a group of peptides occurring in the brain and other tissues of vertebrates, and resembling opiates, that react with the brain's opiate receptors to raise the pain threshold.
any tissue connecting two parts of a body organ or structure.
a commercial form of this substance, obtained from beef and hog pituitary glands or especially by synthesis, and used chiefly in obstetrics to induce labor and to control postnatal hemorrhage.
a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a lightening of the skin.
an anterior pituitary polypeptide hormone that stimulates lactation by the mammary glands at parturition in mammals, the activity of the crop in birds, and in some mammalian species the production of progesterone by the corpus luteum.
any localized, abnormal structural change in the body.